Zhong Shichuan, Hang Lifeng, Wen Lulu, Zhang Tao, Cao An, Zeng Pan, Zhang Hanlin, Liu Dilong, Cai Weiping, Li Yue
Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences Hefei 230031 Anhui P. R. China
The Department of Medical Imaging, Guangdong Second Provincial General Hospital Guangzhou 518037 P. R. China.
Nanoscale Adv. 2023 Feb 15;5(6):1776-1783. doi: 10.1039/d3na00008g. eCollection 2023 Mar 14.
We develop a tunable, ultrafast (5 seconds), and mass-producible seed-mediated synthesis method to prepare branched Au superparticles consisting of multiple small Au island-like nanoparticles by a wet chemical route. We reveal and confirm the toggling formation mechanism of Au superparticles between the Frank-van der Merwe (FM) growth mode and the Volmer-Weber (VW) growth mode. The key factor of this special structure is the frequent toggling between the FM (layer by layer) growth mode and the VW (island) growth mode induced by 3-aminophenol, which is continuously absorbed on the surface of newborn Au nanoparticles, leading to a relatively high surface energy during the overall synthesis process, thus achieving an island on island growth. Such Au superparticles demonstrate broadband absorption from visible to near-infrared regions due to their multiple plasmonic coupling and hence they have important applications in sensors, photothermal conversion and therapy, We also exhibit the excellent properties of Au superparticles with different morphologies, such as NIR-II photothermal conversion and therapy and SERS detection. The photothermal conversion efficiency under 1064 nm laser irradiation was calculated to be as high as 62.6% and they exhibit robust photothermal therapy efficiency. This work provides insight into the growth mechanism of plasmonic superparticles and develops a broadband absorption material for highly efficient optical applications.
我们开发了一种可调节、超快速（5秒）且可大规模生产的种子介导合成方法，通过湿化学路线制备由多个小的金岛状纳米颗粒组成的分支状金超粒子。我们揭示并证实了金超粒子在弗兰克 - 范德梅尔韦（FM）生长模式和沃尔默 - 韦伯（VW）生长模式之间的切换形成机制。这种特殊结构的关键因素是由3 - 氨基苯酚诱导的FM（逐层）生长模式和VW（岛状）生长模式之间的频繁切换，3 - 氨基苯酚持续吸附在新生金纳米颗粒的表面，导致在整个合成过程中表面能相对较高，从而实现岛中岛生长。由于其多重等离子体耦合，这种金超粒子在可见光到近红外区域表现出宽带吸收，因此它们在传感器、光热转换和治疗方面具有重要应用。我们还展示了不同形态的金超粒子的优异性能，如近红外二区光热转换和治疗以及表面增强拉曼光谱检测。计算得出在1064 nm激光照射下的光热转换效率高达62.6%，并且它们表现出强大的光热治疗效率。这项工作深入了解了等离子体超粒子的生长机制，并开发了一种用于高效光学应用的宽带吸收材料。
